Version:           1.1.2 (using KDE KDE 3.4.2)
Installed from:    FreeBSD Ports
Compiler:          gcc 3.4.4 
OS:                FreeBSD

[New LWP 100095]
[Switching to LWP 100095]
0x29e52fbf in wait4 () from /lib/libc.so.6
#0  0x29e52fbf in wait4 () from /lib/libc.so.6
#1  0x29e2fc33 in waitpid () from /lib/libc.so.6
#2  0x29dd90f2 in waitpid () from /usr/lib/libpthread.so.2
#3  0x293a2156 in KCrash::defaultCrashHandler (sig=11) at kcrash.cpp:251
#4  0x29de1cef in sigaction () from /usr/lib/libpthread.so.2
#5  0xbfbfff94 in ?? ()
#6  0x0000000b in ?? ()
#7  0xbfbfdda0 in ?? ()
#8  0xbfbfdae0 in ?? ()
#9  0x00000000 in ?? ()
#10 0x29de13d4 in sigaction () from /usr/lib/libpthread.so.2
#11 0x2bc8a3e8 in Akregator::FeedGroup::slotDeleteExpiredArticles (this=0x8d7c300) at feedgroup.cpp:246
#12 0x2bc8a3e8 in Akregator::FeedGroup::slotDeleteExpiredArticles (this=0x8c8cf00) at feedgroup.cpp:246
#13 0x2bca6c27 in Akregator::View::slotDeleteExpiredArticles (this=0x7) at akregator_view.cpp:514
#14 0x2bcab333 in Akregator::View::qt_invoke (this=0x8a0b500, _id=123, _o=0xbfbfdfb0) at akregator_view.moc:417
#15 0x297f4f55 in QObject::activate_signal () from /usr/X11R6/lib/libqt-mt.so.3
#16 0x297f4e5a in QObject::activate_signal () from /usr/X11R6/lib/libqt-mt.so.3
#17 0x29b33bdf in QTimer::timeout () from /usr/X11R6/lib/libqt-mt.so.3
#18 0x29816da8 in QTimer::event () from /usr/X11R6/lib/libqt-mt.so.3
#19 0x29795b69 in QApplication::internalNotify () from /usr/X11R6/lib/libqt-mt.so.3
#20 0x29794f96 in QApplication::notify () from /usr/X11R6/lib/libqt-mt.so.3
#21 0x29319283 in KApplication::notify (this=0xbfbfe550, receiver=0x8c70ec0, event=0xbfbfe2f0) at kapplication.cpp:549
#22 0x29785743 in QEventLoop::activateTimers () from /usr/X11R6/lib/libqt-mt.so.3
#23 0x2973f420 in QEventLoop::processEvents () from /usr/X11R6/lib/libqt-mt.so.3
#24 0x297a8893 in QEventLoop::enterLoop () from /usr/X11R6/lib/libqt-mt.so.3
#25 0x297a87ea in QEventLoop::exec () from /usr/X11R6/lib/libqt-mt.so.3
#26 0x29795cc7 in QApplication::exec () from /usr/X11R6/lib/libqt-mt.so.3
#27 0x08060c17 in main (argc=7, argv=0x7) at main.cpp:156

That happens if I leave kontact running (Which I've taken to doing as I use akregator and like having it inside kontact) for a while (say 12 hours or so).  I would think kmail and akregator to be the only relevant plugins as they are the only two in the system tray, but jic, I also have Contacts, Calendar, To-do, Journal, News, Notes, and Synchronisation shown.  Please ask if there is any more info that I could give that would help.